package band.wukong.practice.java.demo.fileparser;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.text.*;
import javax.swing.*;

public class LineNumOfSomeone extends JFrame
{
	private JPanel topPanel = new JPanel();
	private JPanel bottomPanel = new JPanel();
	private JButton fileChoose = new JButton("选择目录");
	private JTextField fileField = new JTextField(20);
	private JFileChooser fc = new JFileChooser("选择目录");
	private JTextArea filePathArea = new JTextArea(5 , 20);
	//判断是否属于"/* */注释"
	private boolean isExplainStatus = false;

	//存储代码总行数值
	private int totalCount = 0;
	//存储注释总行数值
	private int explainCount = 0;
	//存储空行总行数值
	private int spaceCount = 0;
	//存储单个文件行数值
	private int count = 0;
	private InputStream input = null;
	private BufferedReader br = null;

	private String totalPath = "";
	private DecimalFormat myFormat = null;

	public LineNumOfSomeone(String title)
	{
	    super(title);
	    //设置面板
        Container container = getContentPane();
        container.setLayout(new BorderLayout());
        topPanel.setLayout(new GridLayout(1 , 2));
        bottomPanel.setLayout(new BorderLayout());
        topPanel.add(fileChoose);
        topPanel.add(fileField);
        bottomPanel.add(new JScrollPane(filePathArea));
        filePathArea.setText("java文件：");
        container.add(topPanel , BorderLayout.NORTH);
        container.add(bottomPanel , BorderLayout.CENTER);

        //添加选择目录监听，默认获取的是选择文件所在的父目录，程序统计对象是此父目录及其子目录下的所有java文件
        fileChoose.addActionListener(new ActionListener()
        {
			public void actionPerformed(ActionEvent e)
			{
				int result = fc.showOpenDialog(LineNumOfSomeone.this);
				if(result == JFileChooser.APPROVE_OPTION)
				{
					String path = fc.getSelectedFile().getAbsolutePath();
					path = path.substring(0 , path.lastIndexOf("\\"));
                    fileField.setText(path);
                    File file = new File(path);
                    CalculateLineNum(file);
				}
			}
        });
	}

	/*
	 * 计算并显示统计信息
	 */
	private void CalculateLineNum(File file)
	{
		if(file.exists())
		{
			displayLineNum(file);
			myFormat = (DecimalFormat)NumberFormat.getPercentInstance();
			myFormat.applyPattern("0.00%");
			if(totalCount != 0)
			{
			    double programPercent = (double)(totalCount - explainCount - spaceCount)/(double)totalCount;
			    double explainPercent = (double)explainCount/(double)totalCount;
			    double spacePercent = (double)spaceCount/(double)totalCount;
			    filePathArea.setText(filePathArea.getText() + "\n" + " 总行数：" + totalCount + "行");
			    filePathArea.setText(filePathArea.getText() + "\n" + " 程序行数：" + (totalCount - explainCount - spaceCount) + "行,百分比："+myFormat.format(programPercent));
			    filePathArea.setText(filePathArea.getText() + "\n" + " 注释行数：" + explainCount + "行,百分比："+myFormat.format(explainPercent));
			    filePathArea.setText(filePathArea.getText() + "\n" + " 空行行数：" + spaceCount + "行,百分比："+myFormat.format(spacePercent));
			}
			else
			{
				filePathArea.setText(filePathArea.getText() + "\n" + " 总行数：" + totalCount + "行");
			}
		}
	}

	//循环访问目录及子目录，统计代码总行数，注释行数及空行行数
	public void displayLineNum(File file)
	{
		totalPath+= "   ||   " + file.getName();
		String[] subPaths = file.list();
		if(subPaths.length == 0)
		{
			totalPath = totalPath.substring(0 , totalPath.lastIndexOf("   ||   "));
			return;
		}
		//循环对子目录进行访问计算行数处理
		for(int i = 0 ; i < subPaths.length ; i++)
		{
			count = 0;
			File subFile = new File(file.getAbsolutePath() + "\\" + subPaths[i]);
			if(subFile.isFile())
			{
			    String subFilePath = subFile.getAbsolutePath();
			    String extendName = subFilePath.substring(subFilePath.lastIndexOf(".") + 1 , subFilePath.length());
			    if(!extendName.equals("java"))
			    {
				    continue;
			    }
			    try
			    {
			        input = new FileInputStream(subFile);
			        BufferedReader br = new BufferedReader(new InputStreamReader(input));
			        String lineValue = br.readLine();
			        while(lineValue != null)
			        {
			            count++;
			            //对两种不同类型注释分别处理，对空行用空字符串来判断
			            if(isExplainStatus == false)
			            {
					        if(lineValue.trim().startsWith("//"))
					        {
					    	    explainCount++;
					        }
					        if(lineValue.trim().equals(""))
					        {
					    	    spaceCount++;
					        }
					        if(lineValue.trim().startsWith("/*"))
					        {
					        	explainCount++;
					    	    isExplainStatus = true;
					        }
			            }
			            else
			            {
			            	explainCount++;
					        if(lineValue.trim().startsWith("*/"))
					        {
					    	    isExplainStatus = false;
					        }
			            }
					    lineValue = br.readLine();
				    }
				    totalCount+= count;
				    String totalPath1 = totalPath + "   ||   " + subFile.getName();

				    //显示单个文件的行数
				    filePathArea.setText(filePathArea.getText() + "\n" + totalPath1 + "   行数：" + count + "行--------totalCount:"+ totalCount);
				    br.close();
				    input.close();
				}
				catch (Exception e)
				{
				    e.printStackTrace();
				}
			}
			else
			{
				//循环调用displayLineNum函数，实现统计子目录行数数据
			    displayLineNum(subFile);
			}
		}
		totalPath = totalPath.substring(0 , totalPath.lastIndexOf("   ||   "));
	}

	public static void main(String args[])
	{
		LineNumOfSomeone lineFrameOfSomeone =new LineNumOfSomeone("java程序行数统计");
		lineFrameOfSomeone.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		lineFrameOfSomeone.setBounds(212,159,600,420);
		lineFrameOfSomeone.setVisible(true);
		lineFrameOfSomeone.setResizable(false);
	}
}